general: rename wrappers to ffi for coherency with rest of repo

src/lib.rs

@@ -3,6 +3,6 @@
     Copyright (C) 2025 Erick Ahmed
 */
 
-pub mod wrappers {
+pub mod ffi {
     pub mod point;
 }

tests/point_test.rs

@@ -3,7 +3,7 @@
     Copyright (C) 2025 Erick Ahmed
 */
 
-use arc_core::wrappers::point::Point;
+use arc_core::ffi::point::Point;
 
 #[test]
 fn point_creation() {